If you want Bruce to start hitting you play him, simple. You might to look to rest his a bit more agaisnt a particularly tough lefty, but sending him to the bench "until he starts hitting" means you have likely stretched out he time period until he starts hitting.
Bruce is a special talent. He needs to play and he will reward us. He actually looked much better at the plate last night and I certainly wouldn't be benching him now. His 12th inning walk was well earned and preceeded 4 insurance runs.